ANT101H5 Lecture Notes - Allele Frequency, Zoonosis, Probability Distribution

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31 Jan 2013
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Chapter 4 Lecture
Modern Theory of Evolution
Page 60 and 61** good summary and definition
Modern synthesis Darwin and Wallace idea of natural selection and
combines the role of variation for evolution to operate
Modern Synthesis
Variation in a population sexual reproduction and recombination are a
much higher source of variation in a population
o Produced by mutation only source of new alleles (in a
interbreeding population)
o Mixed, distributed by recombination and sexual reproduction
o Redistributed through pollutions by gene flow, genetic drift
Natural selection genetic differences result in higher reproductive fitness
for some individuals (due to different reproduction and sexual selection)
o Ie. Finches, moths, bacterial, giraffes and swifts (from past notes)
o Reproductive fitness
** Variation is already in the population and does not arise when needed and
natural selection works with that (acts upon)
Evolution change in the genetic structure of a population
Long time scale aka. Macroevolutionary
o Large often visible phenotype changes in populations
o Including speciation new species
Shorter time scale aka. Microevolutionary
o Change in allele frequencies within the population from one
generation to the next
o Page 80
o When measuring allele frequencies, you look at the genotypes
ABO blood group alleles: ____ O____ B____ A___
Distribution in a pop.: 80% 10% 10%
Change over time to: 70% 15% 15%
Population
Population - A group of interbreeding individuals; marked by a degree of
genetic relatedness and shares a common gene pool
o In theory, homo sapiens are one species entire population is
capable of interbreeding with each other with fertile offspring
Factors that determine mate choice are geographical, ecological and social
Sources that Produce and Redistribute Genetic Variation (pg. 61-65)
Produce Variation
o Sexual reproduction/meiosis variation in phenotypes
o Recombination variation in phenotypes
o Mutation only source new alleles and phenotypic variation
Page 62-63**
Redistribution Variation
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